Light emitting device and method of manufacturing thereof

摘要

A light emitting device includes a package having side walls which define a recess, a light emitting element arranged in the recess, and a sealing member which seals the light emitting element. The sealing member includes a first portion which contains a fluorescent material and covers the light emitting element, and a second portion which does not contain a fluorescent material and is arranged over the first portion. The fluorescent material is a fluoride fluorescent material activated with tetravalent manganese represented by the following formula (I). The particles of the fluorescent material has a surface region with a tetravalent manganese ion concentration is lower than inner side.
A2[M1-bMn4+bF6]  (I)
In the formula (I), A is a cation which contains K+ and may contain at least one selected from the group consisting of Li+, Na+, Rb+, Cs+, and NH4+, M is at least one of 15 Group 4 and Group 14 elements, and 0

主权项

1. A light emitting device comprising:
a package having side walls which define a recess; a light emitting element arranged in the recess; and a sealing member which seals the light emitting element; wherein the sealing member comprises:
a first sealing member portion covering the light emitting element, the first sealing member portion comprising a first binder portion, and fluorescent material particles located in the first binder portion, anda second sealing member portion covering the first sealing member portion, the second sealing member portion comprising a second binder portion, and substantially no fluorescent material particles located in the second binder portion, wherein the fluorescent material particles include particles of a fluoride fluorescent material that is activated with tetravalent manganese ions and has a chemical composition represented by the following formula (I),
A2[M1-bMn4+bF6]  (I) wherein A is a cation which contains at least K+ and may further contain at least one selected from the group consisting of Li+, Na+, Rb+, Cs+, and NH4+, M is at least one element selected from the group consisting of Group 4 elements and Group 14 elements, and 0